废铁屑膜分离法处理含铬废水的研究李爱阳

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30 920089武 汉 理 工 大 学 学 报JOURNALOFWUHANUNIVERSITYOFTECHNOLOGYVol.30 No.9 Sep.2008-李爱阳1,李大森2,胡波年1,蔡 玲1,3,朱志杰3(1.,421002;2.,410001;3.,410083) : 采用中和沉降-膜分离法处理含铬废水,此法处理含铬废水效果明显。试验结果表明:处理后的含铬废水出水水质与中和沉降条件、过滤条件等操作参数有关。当中和pH值为3—4,还原时间为2h,纳滤膜过滤温度为70℃,操作压力为0.7MPa,进料流量为50L/h时,含铬废水中的Cr(Ⅵ)、总Cr、CODCr和悬浮物的去除率分别达到99.5%,99.5%,97%和93.1%,出水水质达到国家《污水综合排放》一级标准。: 含铬废水处理; 废铁屑; 纳滤; 还原; 沉降: X703.1: A:1671-4431(2008)09-0072-04ResearchonChromium-containingWastewaterTreatmentbyWasteIron-membraneSeparationLIAi-yang1,LIDa-sen2,HUBo-nian1,CAILing1,3,ZHUZhi-jie3(1.DepartmentofChemicalEngineering,HunanInstituteofTechnology,Hengyang421002,China;2.BroadHomesIndustralCorporation,Changsha410001,China;3.SchoolofChemistryandChemicalEngineer,CentralSouthUniversity,Changsha410083,China)Abstract: Neutralizasedimentation-membraneseparationwasappliedtotreatchromium-containingwastewater.Inthisway,ithadeffectfortreatingchromium-containingwastewater.Theresultsshowedthatthewaterqualityoftreatedchromi-um-containingwastewaterconnectedwiththeoperationparameter,suchasneutraliza-sedimentationandfiltrationcondition.WhenneutralizapHis3—4,reductiontimewas2h,nanofiltration-filtrationtemperature,operationpressureandfeedflowrateare70℃,0.7MPa,and50L/h,theremovalratesofCr(Ⅵ),totalCr,CODCrandsuspensionsubstancereached99.5%,99.5%,97%and93.1%respectively.Theeffluentwatercouldreached《NationalIntegratedWastewaterDischargeStan-dards》nationalfirstclassdischarge.Keywords: chromium-containingwastewater; wasteiron; nanofiltration; reduction; sedimentation:2008-04-25.:(07C030)(06KG59).:(1969-),,,.E-mail:layllp@126.com、。(Cr),,。,,,,。、、,,,、CODSS,、、、,,COD、SS《》(GB8978—1996)。,,,、COD、SS《》。1 ,1。1 Cr(Ⅵ)/(mg·L-1)Cr/(mg·L-1)CODCr/(mg·L-1)SS/(mg·L-1)pH50—100100—3001500—3000800—10004—60.51.5100706—92  2.1  ,;ICPS—1000Ⅱ:;pH:—HI8428,microcomputer,pHmeter,;JB-IA:;NTR—7450:。2.2  1) H+,,Ca(OH)2pH8—10,。2) ,,0.5—1.0MPa,。,90%,,10,。,,,。2.3  ,,,pH2—4,。,10%Ca(OH)2pH8—10,,,、CODCrSS。,,、CODCrSS,、CODCrSS,《》(GB8978—1996)。3 3.1 Cr(Ⅵ)  1)Cr(Ⅵ) 1∶11∶1,22h。2,,,。,。2 Cr(Ⅵ)pHCr(Ⅵ)/%1∶1pH1∶1pH299.8762.5399.7360.9499.6158.6598.8452.4  2)pHCr(Ⅵ) ,,pH2、3、4、5,,、pHCr(Ⅵ),1。1,pH3—4,,Cr(Ⅵ);pH4,。pH,7330 9          ,:-          ,,pH3—4。3.2 Cr(Ⅲ)  1)Cr(Ⅲ) ,pH。Ca(OH)2,pH8—9,Cr(Ⅲ)Cr(OH)3,10min、20min、30min、40min、50min,3。3,,Cr(Ⅲ),30min,Cr(Ⅲ)。3 Cr(Ⅲ)/minCr(Ⅲ)/%1031.22049.63062.54063.25063.9  3,Cr(Ⅲ),Cr(Ⅲ),Cr(Ⅲ),,,Cr(Ⅲ)Cr(OH)3。CrCl3,4。  4,Ca(OH)2,CrCl3Cr(Ⅲ),4 2Cr(Ⅲ)/(mg·L-1)/(mg·L-1)/%CrCl33001.099.7290105.563.1Cr(Ⅲ)1mg/L。,。2)Cr(Ⅲ) pH8—9,30min,Cr(Ⅲ)、CODCrSS,5。  5,,Cr(Ⅲ),CODCrSS,Fe2+、Fe3+Fe(OH)2Fe(OH)3,Fe(OH)3Fe(OH)2+、Fe(OH)+2,,5 Cr(Ⅲ)/%Cr(Ⅲ)/(mg·L-1)290107.962.8CODCr/(mg·L-1)28001733.238.1SS/(mg·L-1)950450.352.6,。3.3 ,NTR—7450,Cr(Ⅲ)。1) ,2。2,。,,,,,,,,,,,50L/h。2) ,3。3,,,,0.7MPa,74                                       20089,0.7MPa。3) ,4。4,,。,,,70℃,,,70℃。  4) Cr(Ⅲ),6。66 Cr(Ⅲ)Cr(Ⅲ)/(mg·L-1)21.6842.7758.2179.0896.34115.22Cr(Ⅲ)/(mg·L-1)00.00790.04590.5931.323.17/%10099.9899.9299.2598.6397.25,Cr(Ⅲ),,,,,。3.4 -,,,《》(GB8978—1996),7。7 Cr(Ⅵ)/(mg·L-1)Cr/(mg·L-1)CODCr/(mg·L-1)SS/(mg·L-1)9329028009500.431.3979.265.5/%99.599.597.293.14  a.,,,Cr(Ⅲ),,,Cr(Ⅵ)Cr(Ⅲ),、CODCrSS。b.,Cr(Ⅵ)99%。,。,pH3—4,2h,。c.0.7MPa,50L/h,70℃,,、CODCrSS99.5%、97.2%93.1%,《》(GB8978—1996)。[1] ,.[M].:,2000.[2] ,,.-[J].,2004,24(12):18-21.[3] ,.[J].,2005,31(7):42-45.[4] ,.(Ⅵ)[J].,2005,31(6):56-59.[5] ,,.[J].,2006,32(8):9-12.[6] .[J].,2002,16(9):49-50.[7] KratochvilDB.AdvancesinBiosorptionofHeavyMetals[J].TrendsinBiotechnology,1998,16(7):291-300.[8] ShermanM,JohnG,ThomasE.RemediationofCr(Ⅵ)andPb(Ⅱ)AqueousSolutionsusingSupportedNanoscaleZero-valueIron[J].EnvironmentScience&Technology,2000,34(12):2564-2569.7530 9          ,:-          

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